Hardcoded md5 serial number crack

[Jupiter]

When I saw title of this thread ("Hardcoded md5 serial number crack") my first thought was "COLLISIONS". But no one mentioned MD5 collisions yet.

It's better to threat serial number as bytes (not as text) to successfully implement an attack.

You can find appropriate MD5 collision sources at GitHub, for example:
MD5 collision

Originally Posted by TmC

Don't understand

May be he means MD5 initial values from reference implementation.